Furnace.



No. 65l,278. Patentgd June 5, I900.

E. R. SWA-N.

FURNAGE.

(Application filed Mar. 27, 1899.)

(No Model.)

' will mm! to UNITED STATES PATENT CFErcE.

EUGENE R. SWAN, OF CEDAR RAPIDS, IOWA, ASSIGNOR TO ELLA F. SWVAN, OF SAME PLACE.

FURNACE.

SPECIFICATION formingpart of Letters Patent No. 651 ,278, dated June 5, 1900.

Application filed March 2 7, 1 8 9 9.

To all whom it may concern;

Be it known that I, EUGENE R. SWAN, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates more particularly to that class of furnaces used for heating buildings, though it is capable of other uses; and it has for its object both the burning of the fuel from beneath with a downdraft and the provision of an annular chamber surroundin g the fire-pot just above the grate and opening into the fire-pot to receive the gases from the coal, which are burned therein and the heat and products of combustion from which pass up through suitable openings into one or more radiators and thence pass to the smoke stack, the entire construction being designed to produce the greatest amount of heat without the production of smoke and with the greatest economy of fuel.

The novelty of my invention will be here- 'inafter set forth, and specifically pointed out in the claims.

In the accompanying drawings, Figure 1 is a central section, in side elevation, of a furnace embodying my invention. Fig. 2 is a diminished plan View of the lower radiator partially surrounding the fire-pot.

The same letters of reference are used to indicate identical parts in both the figures.

A represents the tubular shell or jacket of the furnace, from the closed top of which, at the openings 60, the hot-air pipes extend to registers in the different rooms in the usual or any suitable manner. Within the shell A, at its bottom, is the ash-pit'B, of which b represents the rear end wall and C the door in the shell for giving access to the ash-pit. D is a circular shaking-grate, of the usual or any suitable construction, properly supported just over the ash-pit and directly under the firepot E. The fire-pot E is tubular in its main portion, with an upper dome and an annular enlarged chamber F atits lower end, just above the grate, which chamber I have named the gas-ring. There is a chute G leading from an opening in the shell A, covered bya Serial No. 710,631. (No model.)

draft-door H and opening into the fire-pot for the introduction of fuel.

Partially surrounding the fire-pot is a tubular radiator I, in U form, as seen in Fig. 2, with closed ends and with pipes J opening from the top of the gas-ring into it. In this instance there are three of these pipes, though any suitable number may be employed.

Surrounding the dome of the fire-pot and extending above the same within the shell A is the main radiatorK, into the bottom of which a pipe L from the radiator I opens. The radiator Kis preferablydivided into two compartmentsc d by division-plate e, which plate has an opening, as at f, to permit the products of combustion to pass up from the compartmentcintothecompartmentd. The smoke-stack M passes out from the compartment (1 through the shell A and is carried to any point desired.

N is a door in the front of the shell giving access to the top surface of the grate for the removal of ashes,and O is apipe openingfrom the the upper part of the fire-pot into pipe L,

and a damperPis provided to cover this pipe when swung up or to cover the opening from the radiator I into the pipe L when swung downward, and this damper is controlled by an operating-handle 19.

When the fire is first started,the door H and its draft are closed, the draft in the door C is opened, and the damperP is let down to the position represented by the dotted lines to cover the opening from the radiator I into the pipe L, and a direct upper draft is thus ob tained through the grate, the fuel in the firepot, the pipe-hole, and radiator K to the smoke-stack in order to get the fire started.

As soon as the fire is started and the proper amount of fuel placed in the fire-pot the damper P is raised to close the pipe 0, as shown by the solid lines, the draft in the door C is closed, and the draft in the door H is opened, whereupon the draft will pass downward through the fuel and will force the gases Owing to the location of the annular chamber F outside of the vertical areaiof the firepot the coal placed in the fire-pot does not fill or even get into the said annular chamber, and the same forms a combustion-chamber for the gases expelled from the coal at the bottom of the fire pot under the influence of the downward draft, and the burning of the fuel takes place entirely from beneath, producing an intense heat with such perfect combustion that no smoke is produced. The coal in the fire-pot is replenished from time to time through the door H, as required.

\Vhile I prefer the use of the radiator I, a large part of the advantage of my invention would be secured if said radiator were dispensed with and thepipes J were carried directly into the lower part of the radiator K, as will be readily understood. Again, while I prefer to use the gas-ring or annular chamber F a large part of the advantage of my invention may be obtained by dispensing with said chamber and having the passages or pipes J enter the fire-pot at or near its lower end above the grate. I have found from experience that these pipes will receive the distilled gases, which are consumed in them, and the operation in all other respects would be the same.

Havingthus fully described my invention, I claim 1. In a furnace, the combination of a firepot, a grate beneath the same, a radiator above the same, passages connected with the lower end and upper portion of the fire-pot, respectively, and leading to the radiator, means for closing said passages, a draft-opening into the fire-pot above the fuel, and a second draft-opening below the grate, snbstan tially as specified.

2. In a furnace, the combination of a firepot having at its lower end a projecting 3. In a furnace of the'character described, i

the combination of the fire-pot E, U-shaped radiator I partially surrounding the same, the projecting gas-consuming chamber F at the bottom of the fire-pot, the pipes J connecting the chamber F andradiator I, the pipe Lconnecting the radiator I with a superimposed radiator K, a pipe 0 connecting the upper end of the fire-pot with the pipe L, a damper P for said pipe 0 and the opening from the radiator I, a draft-opening into the fire-pot above the fuel and a second draft-opening below the grate, whereby, said furnace may be burned either with a direct upward draft or with a downward draft through the fuel, substantially as described.

4. In a furnace, the combination of a the pot, a grate beneath the same, a radiator above the same adapted for connection with a smoke-pipe, a passage connected with the lower end of the fire-pot immediately above the grate and communicating with said radiator, a second passage intermediate of the upper portion of the fire-pot and the firstnamed passage, a damper for such passages, a draft-opening into the fire-pot above the fuel, apd a second draft-opening below the grate, substantially as specified.

EUGENE R. SWAN,

Witnesses:

GEORGE S. BAILY, A. W. WILLIAMSON. 

